... as miners may announce false support for a fork, and stay on the standard bitcoin chain when it is time to switch. A variant of this happened after the BIP66 soft fork, which was triggered on a 95% majority, resulting in a long chainfork which took hours to resolve.
...
The only variant was the SPV miners forgot to check the header properly and fucked up.
They didn't check the version number.
So no that argument against 95% holds no water at all.
For 95% to be reached, the network will be above 95% ...
Any few tiny miners not switched over, adding some random extra length to that process will in no way guarantee anything.
They've already missed the boat, and may well continue to miss it for who knows how long.